However, an electric drive in a moving object places very special demands on the technology.  Above all, this applies to the transformers that convert the current, for example from overhead lines, to the motor which in turn drives the wheels.  Even though locomotives and wagons are to be more standardized in the future, at least in Europe, flexibly adaptable traction transformers and components are still needed for the global market, because their power has an impact on the performance of the entire train. Unlike conventional transformers, they must be optimized for use in motion as well as in different air and temperature conditions. Depending on the type and use, traction transformers can be located either in the main compartment of the locomotive (passenger and freight trains), on the roof (streetcars and passenger trains) or even under the train (high-speed trains).  This requires above all a space-saving, lightweight and customizable design. In a factory, the size and weight of the transformer are largely irrelevant; on a train, they are crucial:  The lighter and smaller they are, the better.

In contrast to stationary transformers, traction transformer variants can be found which operate at frequencies of even less than 25 Hz (compared to 50 to 60 Hz).  In addition, Esther or silicone-based fluids are increasingly being used to cope with the sometimes high temperatures of up to 150 °C. Thus, traction transformers are pioneers in the use of alternative insulating fluids, which are increasingly replacing their fossil predecessors in other applications as well.  The advantages:  They are much less flammable and can be used in smaller quantities.  This not only saves raw materials, but also ensures safety in the event of fire.  While weight and safety are core aspects that are important for traction transformers, they must also be able to cope with a wide range of weather conditions, as most traction transformers are mounted externally on the locomotive or on a wagon.  As a result, the design of the housing is often developed hand in hand with train manufacturers in order to optimally adapt it to the train and its engine, whether for high-speed trains, metros or streetcars, standard locomotives, or so-called EMUs - "electric multiple units" (i.e. trains whose engine(s) and transformer(s) are mounted directly on wagons and do not require a locomotive).  To meet these high and varying requirements, MR rail components are optimized for use in trains and can be easily mounted in various transformer housings.

Even though the move toward climate-friendly global mobility is a major effort, the signs are green:  The global market for traction transformers alone is expected to increase to a value of approximately $750 billion, representing more than four percent growth since 2018 (Unife World Rail Market Study).  And this spending is important in order to be able to meet the high demand to some extent.  At the same time, the ongoing shift from fossil fuels to electric propulsion means an even higher demand for electricity.  This is why manufacturers and MR itself are constantly working to make the necessary components even more economical, efficient and lightweight.

In the heart of the traction transformer:

MR's traction solutions include all the essential components you need for your transformers:  Bushings, butterfly valves for cooling systems, oil-flow indicators, oil level indicators, overpressure valves, PT100 for thermal control, and thermostats.